The emission nebula of NGC 4236
Published 3 Nov 2023

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A cropped zoom of NGC 4236

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Continuum subtracted Ha image showing the emission nebula within NGC 4236

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Annotated image of NGC 4236 (click image for full res)

About this object

NGC 4236 is a relatively faint (mag 10.3) barred spiral galaxy we see on an oblique angle to us. It's located in the constellation Draco. NGC 4236 is part of the M81 local group of galaxies which also includes M81 and M82. It lies roughly 11.7 million light years distant. I've seen many nice images of NGC 4236 but not too many highlighting the emission nebula within the galaxy. There are many beautiful emission nebula (highlighted in pink) which show quite a bit of nice detail on the outer edges of the galaxy. Some of them are huge in comparison to the size of the galaxy. Some are also intermixed with bright blue star star forming regions. You can zoom in by clicking on the full res image on top. I've included a continuum subtracted Ha image where all the starlight has been removed so you can see the extent of the areas of hydrogen emission. In the annotated image there are also many catalogued and uncatalogued faint galaxies in the background. A nice galaxy cluster seems to be just to the right of the top part of the galaxy.
Image Details

  • Optics : Stellarvue SVX 152T refractor @f8 1200mm FL
  • Mount: Paramount MYT
  • Camera: ZWO ASI6200
  • Filters: Chroma 50mm LRGB, Astrodon 50mm 5nm Ha
  • Exposure (min): LRGBHa 181:120:120:128:600 19.2hrs hrs,1x1 binning
  • Automation Control: The Sky X, Voyager, PrimaluceLab Eagle 4
  • Guiding: StarlightXpress Lodestar X2
  • Processing Software: PixInsight
  • Location: Stark Bayou Observatory, Ocean Springs, MS
  • Sky: Typical SQM 18.8-20.1, Bortle 5, Suburban
  • Date: 9 May-20Jun 2022, 19Dec 22-18Feb 23
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